CN109142862A - A kind of intelligent electrically engineering survey system and its measurement method - Google Patents
A kind of intelligent electrically engineering survey system and its measurement method Download PDFInfo
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- CN109142862A CN109142862A CN201811034791.4A CN201811034791A CN109142862A CN 109142862 A CN109142862 A CN 109142862A CN 201811034791 A CN201811034791 A CN 201811034791A CN 109142862 A CN109142862 A CN 109142862A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention belongs to technical field of electrical measurement, a kind of intelligent electrically engineering survey system and its measurement method are disclosed, the intelligent electrical engineering survey system includes: current detection module, voltage detection module, resistance detection module, main control module, frequency measuring block, short-circuit prediction module, alarm module, data memory module, display module.The pencil of matrix analysis method and Singular Value Decomposition Using technology for the sampling matrix that the present invention is constructed by frequency measuring block using reference signal and measured signal, simplify calculating process, calculation amount is greatly reduced, and can quickly, accurately calculate the frequency of sinusoidal signal in power frequency data window；Meanwhile by short-circuit prediction module according to the current conditions on real-time monitoring electric wiring L line, the generation of short-circuit conditions can be predicted in time and carries out power-off protection, it is possible to prevente effectively from the generation of electrical disaster, ensures the property and life security of people.
Description
Technical field
The invention belongs to technical field of electrical measurement more particularly to a kind of intelligent electrical engineering survey system and its measurements
Method.
Background technique
Measurement is that people recognize objective things, and describe objective things with number concept, and then reach and gradually grasp things
Essence and disclose the natural law a kind of means.Wherein, electric measurement is a kind of essential hand of contemporary industry development
Section.Electric measurement is the basic means measured to the information of the material world with control.It has merged microelectric technique, has calculated
Machine technology, the communication technology, network technology, modern measure technology of new element new material etc. are New technical uses in modern industry
Do more, most fast one of direction.The object of electric measurement mainly reflects the physical quantity of electrically and magnetically feature, such as electric current (I), voltage
(U), electrical power (P), magnetic induction intensity (B) etc..Production technology and in terms of, many new thoughts and concept are not
Disconnected to emerge in large numbers, moreover, interpenetrating between different subjects, mixing together, derivative new research field rapidly changes conventional electrical
The looks of equipment manufacture industry, successive generations of products are extremely frequent.However, in the power system, the transient state letter especially after failure
Number, other than containing power frequency component, there are also a large amount of integer harmonics, nonstoichiometric oxide and attenuating dc component, cause calculating electricity
It is affected when power frequency by these components, error is big；Meanwhile electric power short circuit is that one of main reason of electrical fire cannot
It is predicted in time, be easy to cause huge property loss and personal injury.
In conclusion problem of the existing technology is: in the power system, the transient signal especially after failure removes
Containing outside power frequency component, there are also a large amount of integer harmonics, nonstoichiometric oxide and attenuating dc component, cause calculating power frequency
When be affected by these components, error is big；Meanwhile electric power short circuit be one of main reason of electrical fire cannot in time into
Row prediction, be easy to cause huge property loss and personal injury.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of intelligent electrical engineering survey system and its measurements
Method.
The invention is realized in this way a kind of intelligent electrical engineering survey method, the electrical engineering survey of intelligence
Method the following steps are included:
Step 1 measures current data information using ammeter by current detection module；Pass through voltage detection module benefit
Voltage data information is measured with voltmeter；Resistance data information is measured using ohmmeter by resistance detection module；
Step 2, main control module scheduling frequency measurement module is using data calculation procedure according to the measurement of electric parameter of detection
Electrical frequency data；
The frequency measuring block measurement method includes:
(1) to sampling N number of point in one period of current signal to be measured, and obtained sampled signal is carried out discrete；
(2) by discrete sampled signal, the sampling matrix [I at current signal n moment and n-1 moment to be measured is listedn] and
[In-1]:
Wherein M≤L≤N-M, L, M are setting value；
(3) reference frequency f is setWith reference to, by fWith reference toVoltage signal u (t) is constructed with voltage expression, and is obtained to u (t) is discrete
R-matrix:
(4) by matrix [In]+[U] and [In-1]+[U] characteristic root, obtain n moment and the corresponding phase value θ of n-1nWith
θn-1, and by θnAnd θn-1It finds out and calculates frequency fIt calculates, the fIt calculatesFor frequency to be measured；
(5) f is calculatedIt calculatesWith fWith reference toDifference；
(6) difference is judged whether in the error range of setting, if so, the fIt calculatesAs to measured frequency actual value；If
Calculating frequency f that is no, then will obtainingIt calculatesAs new reference frequency, step (3), (4), (5) are repeated, until calculating frequency and ginseng
Until the difference of frequency is examined in the error range of setting；
Step 3 by short-circuit prediction module according to the current data information prediction short-circuit condition information of detection, and passes through
Alarm module is carried out using abnormal data of the alarm to detection and alarm；
Step 4 utilizes the electric parameter data of memory storage detection by data memory module；Pass through display module
Utilize electric current, the voltage, resistance of display screen display detection.
Further, the short-circuit prediction module prediction technique is as follows:
A, by the current value S on current sensor and controller real-time monitoring electric wiring L line, monitoring frequency is per second
3000 times；
B, the derivative V and second dervative a of every microsecond current variation value are calculated by controller；
C, current value S and default maximum current value I are compared by controller, if S >=I, and V >=30A/ μ s, and a >=5A/ μ
S/ μ s then determines that short circuit will occur for electric wiring；
D, if it is determined that short circuit will occur for electric wiring, then relay is disconnected by controller, carries out power-off protection.
Further, the current detection module rotates appropriate direction as the axis side p using the phase voltage of test point and compensation point
To specifically including:
(1) abc/pq transformation, p axis direction and load current detection point phase voltage rotating vector direction are carried out to load current
Inhibit, the initial phase angle of test point phase voltage vector is 0, then transformation matrix are as follows:
Obtain load current acrobatic skill DC component iqL；
(2) by iqLIt is converted into the acrobatic skill current dc component i injected needed for compensation pointqT；Load phase current magnitude is ILm,
Load current is with voltage angleIt is converted, is obtained by abc/pq:
According to power balance theory, required reactive power Q is loadedLWith the idle function of STATCOM compensation point injected system
Rate is equal, it may be assumed that
Wherein, ULmTo load voltage magnitude, UTmFor STATCOM compensation point phase voltage amplitude；ITmFor STATCOM compensation point
The acrobatic skill current amplitude of injected system；Obtain iqTWith ITmRelationship are as follows:
If the ratio of STATCOM compensation point phase voltage and load phase voltage is K:
UTm/ULm=K；
iqTWith iqLRelational expression are as follows:
By load current acrobatic skill DC component iqLIt is straight that the acrobatic skill electric current injected needed for STATCOM compensation point is converted in real time
Flow component iqT；
(3) to iqTAbc/pq inverse transformation is carried out, p axis direction is consistent with the compensation point phase voltage rotating vector direction STATCOM,
The initial phase angle of compensation point phase voltage vector is α；Then reverse transform matrix are as follows:
Abc/pq inverse transformation equation are as follows:
Obtain compensation point STATCOM output three-phase acrobatic skill current value.
Another object of the present invention is to provide a kind of intelligent electrics for implementing the intelligent electrical engineering survey method
Gas engineering survey system, the intelligent electrical engineering survey system include:
Current detection module, voltage detection module, resistance detection module, main control module, frequency measuring block, short circuit prediction
Module, alarm module, data memory module, display module；
Current detection module is connect with main control module, for measuring current data information by ammeter；
Voltage detection module is connect with main control module, for measuring voltage data information by voltmeter；
Resistance detection module, connect with main control module, for measuring resistance data information by ohmmeter；
Main control module, it is pre- with current detection module, voltage detection module, resistance detection module, frequency measuring block, short circuit
Module, alarm module, data memory module, display module connection are surveyed, is worked normally for controlling modules by single-chip microcontroller；
Frequency measuring block is connect with main control module, for being surveyed by data calculation procedure according to the electric parameter of detection
Measure electrical frequency data；
Short-circuit prediction module, connect with main control module, for being believed according to the current data information prediction short-circuit condition of detection
Breath；
Alarm module is connect with main control module, for passing through alarm to the abnormal data progress of detection and alarm；
Data memory module is connect with main control module, for the electric parameter data by memory storage detection；
Display module is connect with main control module, the data such as electric current, voltage, resistance for being detected by display screen display
Information.
Another object of the present invention is to provide a kind of computers using the intelligent electrical engineering survey system.
Advantages of the present invention and good effect are as follows: the present invention utilizes reference signal and measured signal by frequency measuring block
The pencil of matrix analysis method and Singular Value Decomposition Using technology of the sampling matrix constructed, by matrix carry out QR decompose and
The characteristic root of similarity transformation and correlation matrix calculates, and obtains the phase of measured signal, passes through the phase difference of front and back sampling instant
The frequency of measured signal is calculated, this programme simplifies calculating process compared with the prior art, greatly reduces calculation amount, and
The frequency of sinusoidal signal can quickly, be accurately calculated in power frequency data window；Meanwhile by short-circuit prediction module according to reality
When monitoring electric wiring L line on current conditions, can predict the generation of short-circuit conditions in time and carry out power-off protection, Ke Yiyou
Effect avoids the generation of electrical disaster, ensures the property and life security of people.
Detailed description of the invention
Fig. 1 is that the present invention implements the electrical engineering survey method flow diagram of the intelligence provided.
Fig. 2 is that the present invention implements the electrical engineering survey system structure diagram of the intelligence provided.
In Fig. 2: 1, current detection module；2, voltage detection module；3, resistance detection module；4, main control module；5, frequency
Measurement module；6, short-circuit prediction module；7, alarm module；8, data memory module；9, display module.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
With reference to the accompanying drawing and specific embodiment is further described application principle of the invention.
As shown in Figure 1, a kind of intelligent electrical engineering survey method provided by the invention the following steps are included:
Step S101 measures current data information using ammeter by current detection module；Pass through voltage detection module
Voltage data information is measured using voltmeter；Resistance data information is measured using ohmmeter by resistance detection module；
Step S102, main control module scheduling frequency measurement module are surveyed using data calculation procedure according to the electric parameter of detection
Measure electrical frequency data；
Step S103 by short-circuit prediction module according to the current data information prediction short-circuit condition information of detection, and leads to
Alarm module is crossed using alarm to the abnormal data progress of detection and alarm；
Step S104 utilizes the electric parameter data of memory storage detection by data memory module；By showing mould
Block utilizes the data informations such as electric current, voltage, the resistance of display screen display detection.
As shown in Fig. 2, intelligent electrical engineering survey system provided by the invention includes: current detection module 1, voltage inspection
Module 2, resistance detection module 3, main control module 4, frequency measuring block 5, short-circuit prediction module 6, alarm module 7, data are surveyed to deposit
Store up module 8, display module 9.
Current detection module 1 is connect with main control module 4, for measuring current data information by ammeter；
Voltage detection module 2 is connect with main control module 4, for measuring voltage data information by voltmeter；
Resistance detection module 3 is connect with main control module 4, for measuring resistance data information by ohmmeter；
Main control module 4, with current detection module 1, voltage detection module 2, resistance detection module 3, frequency measuring block 5,
Short-circuit prediction module 6, alarm module 7, data memory module 8, display module 9 connect, for controlling each mould by single-chip microcontroller
Block works normally；
Frequency measuring block 5 is connect with main control module 4, for the electric parameter by data calculation procedure according to detection
Measure electrical frequency data；
Short-circuit prediction module 6, connect with main control module 4, for the current data information prediction short-circuit condition according to detection
Information；
Alarm module 7 is connect with main control module 4, for passing through alarm to the abnormal data progress of detection and alarm；
Data memory module 8 is connect with main control module 4, for the electric parameter data by memory storage detection；
Display module 9 is connect with main control module 4, for being counted by electric current, voltage, the resistance etc. of display screen display detection
It is believed that breath.
Intelligent electrical engineering survey method provided in an embodiment of the present invention the following steps are included:
Step 1 measures current data information using ammeter by current detection module；Pass through voltage detection module benefit
Voltage data information is measured with voltmeter；Resistance data information is measured using ohmmeter by resistance detection module；
Step 2, main control module scheduling frequency measurement module is using data calculation procedure according to the measurement of electric parameter of detection
Electrical frequency data；
The frequency measuring block measurement method includes:
(1) to sampling N number of point in one period of current signal to be measured, and obtained sampled signal is carried out discrete；
(2) by discrete sampled signal, the sampling matrix [I at current signal n moment and n-1 moment to be measured is listedn] and
[In-1]:
Wherein M≤L≤N-M, L, M are setting value；
(3) reference frequency f is setWith reference to, by fWith reference toVoltage signal u (t) is constructed with voltage expression, and is obtained to u (t) is discrete
R-matrix:
(4) by matrix [In]+[U] and [In-1]+[U] characteristic root, obtain n moment and the corresponding phase value θ of n-1nWith
θn-1, and by θnAnd θn-1It finds out and calculates frequency fIt calculates, the fIt calculatesFor frequency to be measured；
(5) f is calculatedIt calculatesWith fWith reference toDifference；
(6) difference is judged whether in the error range of setting, if so, the fIt calculatesAs to measured frequency actual value；If
Calculating frequency f that is no, then will obtainingIt calculatesAs new reference frequency, step (3), (4), (5) are repeated, until calculating frequency and ginseng
Until the difference of frequency is examined in the error range of setting；
Step 3 by short-circuit prediction module according to the current data information prediction short-circuit condition information of detection, and passes through
Alarm module is carried out using abnormal data of the alarm to detection and alarm；
Step 4 utilizes the electric parameter data of memory storage detection by data memory module；Pass through display module
Utilize electric current, the voltage, resistance of display screen display detection.
Further, the short-circuit prediction module prediction technique is as follows:
A, by the current value S on current sensor and controller real-time monitoring electric wiring L line, monitoring frequency is per second
3000 times；
B, the derivative V and second dervative a of every microsecond current variation value are calculated by controller；
C, current value S and default maximum current value I are compared by controller, if S >=I, and V >=30A/ μ s, and a >=5A/ μ
S/ μ s then determines that short circuit will occur for electric wiring；
D, if it is determined that short circuit will occur for electric wiring, then relay is disconnected by controller, carries out power-off protection.
Further, the current detection module rotates appropriate direction as the axis side p using the phase voltage of test point and compensation point
To specifically including:
(1) abc/pq transformation, p axis direction and load current detection point phase voltage rotating vector direction are carried out to load current
Inhibit, the initial phase angle of test point phase voltage vector is 0, then transformation matrix are as follows:
Obtain load current acrobatic skill DC component iqL；
(2) by iqLIt is converted into the acrobatic skill current dc component i injected needed for compensation pointqT；Load phase current magnitude is ILm,
Load current is with voltage angleIt is converted, is obtained by abc/pq:
According to power balance theory, required reactive power Q is loadedLWith the idle function of STATCOM compensation point injected system
Rate is equal, it may be assumed that
Wherein, ULmTo load voltage magnitude, UTmFor STATCOM compensation point phase voltage amplitude；ITmFor STATCOM compensation point
The acrobatic skill current amplitude of injected system；Obtain iqTWith ITmRelationship are as follows:
If the ratio of STATCOM compensation point phase voltage and load phase voltage is K:
UTm/ULm=K；
iqTWith iqLRelational expression are as follows:
By load current acrobatic skill DC component iqLIt is straight that the acrobatic skill electric current injected needed for STATCOM compensation point is converted in real time
Flow component iqT；
(3) to iqTAbc/pq inverse transformation is carried out, p axis direction is consistent with the compensation point phase voltage rotating vector direction STATCOM,
The initial phase angle of compensation point phase voltage vector is α；Then reverse transform matrix are as follows:
Abc/pq inverse transformation equation are as follows:
Obtain compensation point STATCOM output three-phase acrobatic skill current value.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of intelligent electrical engineering survey method, which is characterized in that the intelligent electrical engineering survey method include with
Lower step:
Step 1 measures current data information using ammeter by current detection module；Electricity is utilized by voltage detection module
Table is pressed to measure voltage data information；Resistance data information is measured using ohmmeter by resistance detection module；
Step 2, main control module scheduling frequency measurement module are electrical according to the measurement of electric parameter of detection using data calculation procedure
Frequency data；
The frequency measuring block measurement method includes:
(1) to sampling N number of point in one period of current signal to be measured, and obtained sampled signal is carried out discrete；
(2) by discrete sampled signal, the sampling matrix [I at current signal n moment and n-1 moment to be measured is listedn] and [In-1]:
Wherein M≤L≤N-M, L, M are setting value；
(3) reference frequency f is setWith reference to, by fWith reference toVoltage signal u (t) is constructed with voltage expression, and is referred to u (t) is discrete
Matrix:
(4) by matrix [In]+[U] and [In-1]+[U] characteristic root, obtain n moment and the corresponding phase value θ of n-1nAnd θn-1, and
By θnAnd θn-1It finds out and calculates frequency fIt calculates, the fIt calculatesFor frequency to be measured；
(5) f is calculatedIt calculatesWith fWith reference toDifference；
(6) difference is judged whether in the error range of setting, if so, the fIt calculatesAs to measured frequency actual value；If it is not, then
The calculating frequency f that will be obtainedIt calculatesAs new reference frequency, step (3), (4), (5) are repeated, until calculating frequency and with reference to frequency
Until the difference of rate is in the error range of setting；
Step 3 by short-circuit prediction module according to the current data information prediction short-circuit condition information of detection, and passes through alarm
Module is carried out using abnormal data of the alarm to detection and alarm；
Step 4 utilizes the electric parameter data of memory storage detection by data memory module；It is utilized by display module
Electric current, the voltage, resistance of display screen display detection.
2. intelligent electrical engineering survey method as described in claim 1, which is characterized in that the short circuit prediction module prediction
Method is as follows:
A, by the current value S on current sensor and controller real-time monitoring electric wiring L line, monitoring frequency is per second 3000
It is secondary；
B, the derivative V and second dervative a of every microsecond current variation value are calculated by controller；
C, current value S and default maximum current value I are compared by controller, if S >=I, and V >=30A/ μ s, and a >=5A/ μ s/ μ s
Then determine that short circuit will occur for electric wiring；
D, if it is determined that short circuit will occur for electric wiring, then relay is disconnected by controller, carries out power-off protection.
3. intelligent electrical engineering survey method as described in claim 1, which is characterized in that the current detection module is to examine
The phase voltage of measuring point and compensation point rotates appropriate direction as p axis direction, specifically includes:
(1) abc/pq transformation is carried out to load current, p axis direction and load current detection point phase voltage rotating vector direction press down
System, the initial phase angle of test point phase voltage vector are 0, then transformation matrix are as follows:
Obtain load current acrobatic skill DC component iqL；
(2) by iqL is converted into the acrobatic skill current dc component i injected needed for compensation pointqT；Load phase current magnitude is ILm, load
Electric current is with voltage angleIt is converted, is obtained by abc/pq:
According to power balance theory, required reactive power Q is loadedLWith the reactive power phase of STATCOM compensation point injected system
Deng, it may be assumed that
Wherein, ULmTo load voltage magnitude, UTmFor STATCOM compensation point phase voltage amplitude；ITmFor the injection of STATCOM compensation point
The acrobatic skill current amplitude of system；Obtain iqTWith ITmRelationship are as follows:
If the ratio of STATCOM compensation point phase voltage and load phase voltage is K:
UTm/ULm=K；
iqTWith iqLRelational expression are as follows:
By load current acrobatic skill DC component iqLThe acrobatic skill current DC point injected needed for STATCOM compensation point is converted in real time
Measure iqT；
(3) to iqTAbc/pq inverse transformation is carried out, p axis direction is consistent with the compensation point phase voltage rotating vector direction STATCOM, compensation
The point initial phase angle of phase voltage vector is α；Then reverse transform matrix are as follows:
Abc/pq inverse transformation equation are as follows:
Obtain compensation point STATCOM output three-phase acrobatic skill current value.
4. a kind of electrical engineering survey system of intelligence for implementing the electrical engineering survey method of intelligence described in claim 1,
It is characterized in that, the intelligent electrical engineering survey system includes:
Current detection module, voltage detection module, resistance detection module, main control module, frequency measuring block, short circuit prediction mould
Block, alarm module, data memory module, display module；
Current detection module is connect with main control module, for measuring current data information by ammeter；
Voltage detection module is connect with main control module, for measuring voltage data information by voltmeter；
Resistance detection module, connect with main control module, for measuring resistance data information by ohmmeter；
Main control module, with current detection module, voltage detection module, resistance detection module, frequency measuring block, short circuit prediction mould
Block, alarm module, data memory module, display module connection, work normally for controlling modules by single-chip microcontroller；
Frequency measuring block is connect with main control module, for the measurement of electric parameter electricity by data calculation procedure according to detection
The frequency data of gas；
Short-circuit prediction module, connect with main control module, for the current data information prediction short-circuit condition information according to detection；
Alarm module is connect with main control module, for passing through alarm to the abnormal data progress of detection and alarm；
Data memory module is connect with main control module, for the electric parameter data by memory storage detection；
Display module is connect with main control module, the data informations such as electric current, voltage, resistance for being detected by display screen display.
5. a kind of computer using the electrical engineering survey system of intelligence described in claim 4.
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| CN110672947A (en) * | 2019-09-29 | 2020-01-10 | 龙岩学院 | Intelligent electrical engineering measurement system and measurement method |
| CN110703137A (en) * | 2019-10-22 | 2020-01-17 | 山东科技大学 | Intelligent electrical engineering measurement system |
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